Clock



FIG. 1 is a front perspective view of a clock showing a preferred embodiment of our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevational view thereof of one side;

FIG. 5 is a side elevational view thereof of an opposite side;

FIG. 6 is a back elevational view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a clock, as shown and described. 